CN112059134A

CN112059134A - Vacuum melting atmosphere protection semi-continuous casting system

Info

Publication number: CN112059134A
Application number: CN202011061365.7A
Authority: CN
Inventors: 王风德; 董春波; 王肇飞; 滕宗涛
Original assignee: Yantai Wanlong Vacuum Metallurgy Co ltd
Current assignee: Yantai Wanlong Vacuum Metallurgy Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2020-12-11

Abstract

The invention discloses a vacuum melting atmosphere protection semi-continuous casting system which comprises melting equipment, casting equipment and forming equipment. The vacuum melting atmosphere protection semi-continuous casting system can avoid the contact of high-temperature molten metal and air in the whole casting process, and avoid the burning loss of liquid metal at a high temperature state, so that a metal product with uniform component content and stable performance is prepared, and a reliable process method and equipment are provided for the continuous casting of special alloy containing active easily-oxidizable elements.

Description

Vacuum melting atmosphere protection semi-continuous casting system

Technical Field

The invention relates to the field of metal smelting, in particular to a vacuum smelting atmosphere protection semi-continuous casting system.

Background

Vacuum melting is a special melting technology for melting metal and alloy under vacuum condition, wherein the melting atmosphere is vacuum condition, and the vacuum melting can avoid the contact of the melted metal and the reaction gases of oxygen, nitrogen, hydrogen and the like in the air. The vacuum melting chamber is a common vacuum melting device, metal can be melted under the vacuum condition to obtain casting liquid with higher quality, and the casting blank at the outlet of the crystallizer needs to be cooled by water in common semi-continuous casting, so that the blank shell of the casting blank can not be effectively sealed in vacuum, and the liquid level of the crystallizer and the liquid level of the vacuum protection chamber are subjected to atmosphere protection casting in the casting process. Vacuum overflow in vacuum smelting realizes copper liquid degassing, and atmosphere protection drawing casting prevents harmful gas from re-intruding in the drawing casting process. Greatly reduces the burning loss of the easily oxidized elements in the copper liquid, stabilizes the alloy components of the product and ensures the product performance.

Disclosure of Invention

The invention provides a vacuum melting atmosphere protection semi-continuous casting system, aiming at the problem that the surface of a profile is in contact with air during the existing intermittent vacuum melting, casting and molding process. The system comprises a smelting device, a casting device and a forming device, wherein the smelting device is a vacuum smelting chamber fixed on a metal frame, the vacuum smelting chamber is provided with a vacuumizing device and an inert gas supply device, and the side wall of the vacuum smelting chamber is provided with a gate valve; the casting equipment comprises a vacuum protection chamber and a bottom pouring furnace, the vacuum protection chamber is a sealable vacuum protection chamber, a liquid guide groove is arranged on the side surface of the vacuum protection chamber and can be in sealed butt joint with a gate valve, an opening of the bottom pouring furnace is parallel to the bottom surface of the vacuum protection chamber, a liquid outlet of the liquid guide groove is arranged above the opening of the bottom pouring furnace, a casting water gap is arranged at the bottom of the bottom pouring furnace and is matched with a stopper rod capable of moving up and down, a detachable protective cover is arranged at the liquid outlet end of the casting water gap, sealing before vacuum overflowing and the vacuum protection chamber is filled with protective gas is ensured, the vacuum protection chamber is matched with vacuumizing equipment and inert gas supply equipment, and the casting equipment; the forming equipment comprises a crystallizer and a casting well, the crystallizer is fixed on a crystallizer trolley and is detachably connected with a liquid outlet of a casting nozzle, the crystallizer is matched with a dummy bar, the casting well is arranged right below the crystallizer, and spray water equipment is arranged in the casting well.

The invention is not directly cast from the vacuum melting chamber, but is provided with movable casting equipment, and the vacuum melting chamber can continue to melt after the casting liquid is transferred to the casting equipment, thereby realizing semi-continuous casting. The vacuum melting atmosphere protection semi-continuous casting system can avoid the contact of high-temperature molten metal and air in the whole casting process, and avoid the burning loss of liquid metal at a high temperature state, so that a metal product with uniform component content and stable performance is prepared, and a reliable process method and equipment are provided for the continuous casting of special alloy containing active easily-oxidizable elements.

The crystallizer has the function that the temperature of the crystallizer is properly reduced before casting to enable casting liquid to reach the optimal casting state, the casting nozzle is connected with the crystallizer through the elastic sealing cover, and the elastic sealing cover is fixed on the crystallizer.

Preferably, the liquid outlet end of the casting nozzle is provided with a detachable protective cover, the bottom of the vacuum protective chamber is sealed by the protective cover when the vacuum protective chamber is vacuumized and overflowed and before protective gas is filled to the micro positive pressure, the protective cover is sealed and protected by the elastic sealing cover during the casting operation, and the protective gas is filled between the liquid level of the crystallizer and the casting nozzle to prevent the atmosphere from invading, so that no matter whether the smelting equipment is contacted with the casting equipment or not, the air cannot enter the inside of the system.

Preferably, the dummy bar is provided with a casting machine, which is installed in the casting well. The arrangement of the casting machine is beneficial to demolding and molding of the casting. The spray well is arranged underground and is in sealed contact with the blank pulling device, so that the section bar is not in contact with excessive oxygen or nitrogen in the cooling process, the maximum depth of the spray well is 15 meters, the spray well is suitable for preparing bar blanks or plate blanks with certain length, and continuous bar blanks or plate blanks cannot be prepared, so the spray well is called semi-continuous casting.

The invention is not directly cast from a vacuum smelting chamber, but the vacuum smelting chamber is used for smelting, after the vacuum smelting is finished, a gate valve between the smelting chamber and a casting chamber is opened, a molten copper chute enters an overflowing position under the pushing of a hydraulic cylinder, and molten copper enters a bottom pouring furnace from the smelting furnace through the chute. And then the chute returns to close the gate valve, the vacuum smelting chamber continues smelting, a vacuum protection chamber of the casting chamber is filled with protective gas to slight positive pressure, the sealing of a bottom pouring gate is removed, the crystallizer trolley moves to a casting position, the dummy bar rises to enter the crystallizer, the stopper rod and the casting machine are opened to start casting operation, the casting is finished, the casting chamber moves to a billet ejection position, the crystallizer trolley moves to a preparation position, and the casting billet is lifted out by the crane.

Drawings

FIG. 1 is a schematic structural view of the present invention in operation;

FIG. 2 is a schematic diagram of the present invention after detachment;

FIG. 3 is a schematic structural view of a bottom injection furnace after disassembly according to the present invention;

FIG. 4 is a schematic structural view of a bottom injection furnace in operation of the present invention;

each part is as follows:

1. the device comprises a vacuum smelting chamber, 2, a gate valve, 3, a vacuum protection chamber, 4, a liquid guide groove, 5, a bottom pouring furnace, 6, a pouring nozzle, 7, a stopper rod, 8, a guide rail, 9, a crystallizer, 10, a dummy bar, 11, a crystallizer trolley, 12, a casting well, 13, a protection cover, 14 and an elastic sealing cover.

Detailed Description

The present invention is described below with reference to examples, which are provided for illustration only and are not intended to limit the scope of the present invention.

Example 1

As shown in fig. 1-4, a vacuum melting atmosphere protection semi-continuous casting system comprises a melting device, a casting device and a forming device, wherein the melting device is a vacuum melting chamber 1 fixed on a metal frame, the vacuum melting chamber 1 is provided with a vacuum pumping device and an inert gas supply device, and the side wall of the vacuum melting chamber 1 is provided with a gate valve 2; the casting equipment comprises a vacuum protection chamber 3 and a bottom pouring furnace 5, the vacuum protection chamber 3 is a sealable vacuum protection chamber 3, a liquid guide groove 4 is arranged on the side surface of the vacuum protection chamber 3 and can be in close butt joint with a gate valve 2, the opening of the bottom pouring furnace 5 is parallel to the bottom surface of the vacuum protection chamber 3, the liquid outlet of the liquid guide groove 4 is arranged above the opening of the bottom pouring furnace 5, a pouring nozzle 6 is arranged at the bottom of the bottom pouring furnace 5, the pouring nozzle 6 is matched with a stopper rod 7 capable of moving up and down, a detachable protective cover 13 is arranged at the liquid outlet end of the pouring nozzle 6, the vacuum protection chamber 3 is matched with vacuum pumping equipment and inert gas supply equipment, and the casting equipment; the forming equipment comprises a crystallizer 9 and a casting well 12, the crystallizer 9 is fixed on a crystallizer trolley 11, the crystallizer trolley 11 is provided with hydraulic lifting equipment, the crystallizer 9 is in closed connection when being connected with a casting nozzle 6, the casting nozzle 6 is connected with the crystallizer 9 through an elastic sealing cover 14, the elastic sealing cover 14 is fixed on the crystallizer 9, the crystallizer 9 is matched with a dummy bar 10, the casting well 12 is arranged under the crystallizer 9, spray water equipment is arranged in the casting well 12, the dummy bar 10 is matched with a casting machine, and the casting machine is arranged in the casting well 12.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A vacuum melting atmosphere protection semi-continuous casting system is characterized by comprising melting equipment, casting equipment and forming equipment,

the smelting device is a vacuum smelting chamber fixed on the metal frame, the vacuum smelting chamber is provided with a vacuumizing device and an inert gas supply device, and the side wall of the vacuum smelting chamber is provided with a gate valve;

the casting equipment comprises a vacuum protection chamber and a bottom pouring furnace, wherein the vacuum protection chamber is a sealable vacuum protection chamber, a liquid guide groove is arranged on the side surface of the vacuum protection chamber and can be in close butt joint with the gate valve, the opening of the bottom pouring furnace is parallel to the bottom surface of the vacuum protection chamber, the liquid outlet of the liquid guide groove is arranged above the opening of the bottom pouring furnace, a pouring nozzle is arranged at the bottom of the bottom pouring furnace and is matched with a stopper rod capable of moving up and down, the vacuum protection chamber is matched with vacuumizing equipment and inert gas supply equipment, and the casting equipment is arranged on a guide rail;

the forming equipment comprises a crystallizer and a casting well, the crystallizer is fixed on a crystallizer trolley and is detachably connected with a liquid outlet of the casting nozzle, the crystallizer is matched with a dummy bar, the casting well is arranged right below the crystallizer, and spray water equipment is arranged in the casting well.

2. The vacuum melting atmosphere protected semi-continuous casting system of claim 1, wherein the casting nozzle is connected with the crystallizer through an elastic sealing cover, and the elastic sealing cover is fixed on the crystallizer.

3. The vacuum melting atmosphere protected semi-continuous casting system of claim 1, wherein the pouring nozzle outlet end is provided with a removable protective cover.

4. The vacuum melting atmosphere protected semi-continuous casting system of claim 1, wherein the crystallizer trolley is provided with a hydraulic lifting device, and the crystallizer is hermetically connected with the casting nozzle when being connected.

5. The vacuum melting atmosphere protected semi-continuous casting system of claim 1, wherein the dummy bar is fitted with a strand casting machine, the strand casting machine being mounted in the casting well.

6. The vacuum melting atmosphere protected semi-continuous casting system of claim 1, wherein the casting well has a maximum depth of 15 meters.

7. The vacuum melting atmosphere protected semi-continuous casting system of any one of claims 1 to 6, wherein the system is adapted for producing bar or plate blanks.